P011 Code on 2008 Maxima 3.5L, clean VVT solenoids?

Occasionally have this pop up every few hundred miles (only at 104K). Changing oil doesn't make a difference (using 5W-30). I've cleaned out the VVT solenoid on bank 2 (wasn't dirty), figured I'll try to clean bank 1 if I could easily get to it. Can I get to the solenoid by the firewall without removing the intake? If so, anybody have tips for doing so? Was thinking I might be able to sneak some crows feet in there.